中文摘要：

对滑坡危险度制图进行精度评价具有重要意义。现有对滑坡危险度制图进行评价的研究多集中于评价指标的建立和应用，而评价指标能否有效地度量滑坡危险度图的精度、区分不同质量的滑坡危险度图尚值得研究。针对只使用正样本的评价指标，选择其中3种常用的非阈值依赖性评价指标——预报效率曲线及曲线下面积、P／E曲线及连续Boyce指数和空间聚集度作为精度评价标准，以甘肃省油坊沟流域为研究区，采用正样本和不同的负样本，基于随机森林模型推测生成不同质量的滑坡危险度图，应用3个评价指标对其进行精度评价，验证了各评价指标的有效性。结果发现，预报效率曲线与P／E曲线的分布可以体现不同质量的滑坡危险度图的差异，但是预报效率曲线下的面积只适宜于滑坡危险度高估时的制图精度评价，而连续Boyce指数与空间聚集度只适宜于滑坡危险度低估时的制图精度评价。

英文摘要：

Evaluation of precision of landslide susceptibility mapping is of great significance. At the present time, the study of the evaluation methods in landslide susceptibility mapping focuses on the establishment and application of evaluation indices. Thus, whether the existing evaluation methods can measure the quality of landslide suscepti- bility maps reasonably is worth studying. In this paper, three common evaluation methods, i.e. , the prediction ef- ficiency curve and the area under it, the P/E curve and the continuous Boyce index, and the spatial clustering were selected as their indices independent from the threshold. Youfang Basin in Gansu Province was taken as the study area. Positive sample and different negtive samples were used to construct different landslide susceptibility maps of different qualitits based on random forest model. Three evaluation indices were applied to precision estimation andvalification of their effectiveness. Results show that, the distribution of prediction efficiency curve and the PiE curve may reflect difference of landslide susceptibility maps of different qualities. However, the area under the pre- diction efficiency curve is only suitable to mapping precision evaluation in overestimation of landslide susceptibility and the continuous Boyce index and the spatial clustering is only suitable to mapping precision evaluation in under- estimation of landslide susceptibility.